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Thermos vs. Dewar

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Thermosnoun

A bottle, flask or similar vessel having a vacuum between its inner and outer silvered walls; designed to maintain the temperature of its contents

Dewarnoun

A vacuum flask; a vessel which keeps its contents hotter or cooler than their environment without the need to modify the pressure, by interposing an evacuated region to provide thermal insulation between the contents and the environment.

Thermosnoun

vacuum flask that preserves temperature of hot or cold drinks

Dewar

A double-walled glass vessel for holding liquid air, liquid nitrogen, etc., having the space between the walls exhausted so as to prevent conduction of heat, and sometimes having the glass silvered to prevent absorption of radiant heat; - called also, according to the particular shape, Dewar bulb, Dewar tube, etc.

Dewarnoun

vacuum flask that holds liquid air or helium for scientific experiments

Dewarnoun

Scottish chemist and physicist noted for his work in cryogenics and his invention of the Dewar flask (1842-1923)

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